LSAT Question Explanation
PT 105, Section 4, Question 11
StrengthenArgument structure
The skills for copying curves must be learned before the skills for copying angles.
Some research.
Explanation
This isn't flawed per-se, because it's just a hypothesis based on research we don't know anything about. But the lack of evidence indicates that we should look for an answer choice that would align with how the researcher is coming to their conclusion. In other words, something that supports that children need to be able to copy curves before they can copy angles.
Note that the word "must" indicates that being able to copy curves is necessary for being able to copy angles.
Answer choices
This is outside the scope of the stimulus, because it has nothing to do with angles.
This indicates that the skill for copying curves comes first, because any child who can copy angles also has the skill of copying curves.
This treats copying curves as necessary for copying angles, just like the hypothesis does.
Angles → Curves
This doesn't tell us if children have to learn curves first.
This weakens the hypothesis by showing that some children have learned to copy angles without the ability to copy curves.
This doesn't tell us if the children need to learn curves before angles.